[PATCH] drm/amd/pm: Use kmemdup instead of kmalloc and memcpy

[PATCH] drm/amd/pm: Use kmemdup instead of kmalloc and memcpy

[Tian Tao]

Fixes coccicheck warning:
drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c:255:
36-43: WARNING opportunity for kmemdup

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
---
 drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c
index 740e2fc..1e79baa 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c
@@ -252,12 +252,11 @@ static int init_powerplay_table_information(
 	phm_copy_clock_limits_array(hwmgr, &pptable_information->power_saving_clock_max, powerplay_table->PowerSavingClockMax, ATOM_VEGA12_PPCLOCK_COUNT);
 	phm_copy_clock_limits_array(hwmgr, &pptable_information->power_saving_clock_min, powerplay_table->PowerSavingClockMin, ATOM_VEGA12_PPCLOCK_COUNT);
 
-	pptable_information->smc_pptable = kmalloc(sizeof(PPTable_t), GFP_KERNEL);
+	pptable_information->smc_pptable = kmemdup(&(powerplay_table->smcPPTable),
+						   sizeof(PPTable_t), GFP_KERNEL);
 	if (pptable_information->smc_pptable == NULL)
 		return -ENOMEM;
 
-	memcpy(pptable_information->smc_pptable, &(powerplay_table->smcPPTable), sizeof(PPTable_t));
-
 	result = append_vbios_pptable(hwmgr, (pptable_information->smc_pptable));
 
 	return result;
-- 
2.7.4

Re: [PATCH] drm/amd/pm: Use kmemdup instead of kmalloc and memcpy

[Alex Deucher]

On Tue, Nov 10, 2020 at 11:57 AM Tian Tao <tiantao6@hisilicon.com> wrote:
>
> Fixes coccicheck warning:
> drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c:255:
> 36-43: WARNING opportunity for kmemdup
>
> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c
> index 740e2fc..1e79baa 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega12_processpptables.c
> @@ -252,12 +252,11 @@ static int init_powerplay_table_information(
>         phm_copy_clock_limits_array(hwmgr, &pptable_information->power_saving_clock_max, powerplay_table->PowerSavingClockMax, ATOM_VEGA12_PPCLOCK_COUNT);
>         phm_copy_clock_limits_array(hwmgr, &pptable_information->power_saving_clock_min, powerplay_table->PowerSavingClockMin, ATOM_VEGA12_PPCLOCK_COUNT);
>
> -       pptable_information->smc_pptable = kmalloc(sizeof(PPTable_t), GFP_KERNEL);
> +       pptable_information->smc_pptable = kmemdup(&(powerplay_table->smcPPTable),
> +                                                  sizeof(PPTable_t), GFP_KERNEL);
>         if (pptable_information->smc_pptable == NULL)
>                 return -ENOMEM;
>
> -       memcpy(pptable_information->smc_pptable, &(powerplay_table->smcPPTable), sizeof(PPTable_t));
> -
>         result = append_vbios_pptable(hwmgr, (pptable_information->smc_pptable));
>
>         return result;
> --
> 2.7.4
>
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